21011603344 has 20 divisors (see below), whose sum is σ = 40736142720. Its totient is φ = 10499050400.

The previous prime is 21011603329. The next prime is 21011603351. The reversal of 21011603344 is 44330611012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396232 + ... + 446119.

It is an arithmetic number, because the mean of its divisors is an integer number (2036807136).

Almost surely, 2^21011603344 is an apocalyptic number.

It is an amenable number.

21011603344 is a deficient number, since it is larger than the sum of its proper divisors (19724539376).

21011603344 is a wasteful number, since it uses less digits than its factorization.

21011603344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843918 (or 843912 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 21011603344 in words is "twenty-one billion, eleven million, six hundred three thousand, three hundred forty-four".